Why should login avoid silently trimming a user's password?
Whitespace can be part of the original password. Changing submitted credentials can reject valid users or create inconsistent verification behavior between signup, login, and reset flows.
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More FAQs in What validations should be applied to signup and login forms?
A caller can bypass browser controls and send a request directly. The server must independently verify field types, allowed values, lengths, and relevant business rules.
Do not trust a submitted privilege claim. Establish permitted roles through the application's approved account and invitation workflow, with authorization decisions enforced on the server.
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